Asteroids

2017SN16 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.869

Aphelion (Q)

1.165

Eccentricity (e)

0.146

Inclination (i)

13.4

deg

Orbit period (P)

374.5

Earth MOID

0.09218

U parameter

1.5

Next Earth close approach

Date

2057-10-17

Nominal distance (from Earth center)

0.19534

29222532

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.3

mag

Diameter

60 - 130*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-09-24

Observatory

University of Arizona Mt. Lemmon Survey

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.016813

1-sigma variation

3.211E-8

Unit

Eccentricity (e)

Value

0.145686

1-sigma variation

3.547E-7

Unit

Inclination (i)

Value

13.3768

1-sigma variation

2.727E-5

Unit

Long. of Ascending Node (Ω)

Value

2.6168

1-sigma variation

8.305E-6

Unit

Arg. of Perihelion (ω)

Value

136.8870

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

58.51743

1-sigma variation

0.00019

Unit

Perihelion distance

Value

0.868678

1-sigma variation

Unit

Aphelion distance

Value

1.164948

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.110380

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.096954

1-sigma variation

Unit

MOID

Value

0.092178

1-sigma variation

Unit

Orbit Period

Value

374.5072

1-sigma variation

Unit

U parameter

Value

1.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.03098E-15	5.82292E-15	7.06730E-13	-4.98667E-14	1.10233E-12	-5.26171E-12
e	5.82292E-15	1.25786E-13	5.39780E-12	3.50408E-13	-1.26190E-11	9.42592E-13
i	7.06730E-13	5.39780E-12	7.43711E-10	1.51551E-11	5.61649E-10	-3.31721E-9
Ω	-4.98667E-14	3.50408E-13	1.51551E-11	6.89724E-11	-2.54413E-10	4.77456E-10
ω	1.10233E-12	-1.26190E-11	5.61649E-10	-2.54413E-10	5.70356E-9	-1.26309E-8
M	-5.26171E-12	9.42592E-13	-3.31721E-9	4.77456E-10	-1.26309E-8	3.79403E-8

Date of computation: 2026-06-04 23:11 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

23.347

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

60 - 130*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

736

Unit

Source

[1]

Unobserved

Value

2494

Unit

Source

[1]

Normalized RMS of residuals

Value

0.529193

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-09-24.38929

Unit

Source

[2]

Last Observation

Value

2019-09-30.18558

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

105 (1)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2017SN16 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1976-10-12 03:32	1.0	0.1159669	0.1159519	0.0000050
EARTH	1977-09-29 00:41	2.3	0.1158447	0.1158331	0.0000039
EARTH	1978-09-10 02:06	3.1	0.1856488	0.1856335	0.0000051
EARTH	1979-03-15 06:48	3.6	0.1210492	0.1210327	0.0000055
EARTH	1980-04-07 20:07	2.5	0.1023834	0.1023722	0.0000037
EARTH	2017-10-11 20:18	< 1 min	0.1124213	0.1124206	0.0000002
EARTH	2018-09-28 09:30	< 1 min	0.1188559	0.1188551	0.0000002
EARTH	2019-09-09 03:54	< 1 min	0.1896130	0.1896119	0.0000004
EARTH	2020-03-15 17:08	< 1 min	0.1179571	0.1179549	0.0000008
EARTH	2021-04-09 00:47	< 1 min	0.1049319	0.1049301	0.0000006
EARTH	2057-10-17 07:14	< 1 min	0.1953406	0.1953150	0.0000085
EARTH	2058-10-10 13:48	1.3	0.1052785	0.1052703	0.0000027
EARTH	2059-09-26 01:42	2.5	0.1283182	0.1283032	0.0000050
EARTH	2060-02-18 08:19	4.2	0.1888831	0.1888652	0.0000060
EARTH	2061-03-19 20:51	3.6	0.1084210	0.1084077	0.0000044
EARTH	2062-04-12 13:09	2.4	0.1154263	0.1154081	0.0000061
EARTH	2098-10-15 20:17	< 1 min	0.1511127	0.1510826	0.0000100
EARTH	2099-10-05 17:44	2.5	0.1008739	0.1008685	0.0000018
EARTH	2100-09-18 14:45	3.8	0.1576686	0.1576464	0.0000074
EARTH	2101-03-04 00:11	5.2	0.1546400	0.1546154	0.0000082
EARTH	2102-03-31 09:25	4.1	0.0930018	0.0929998	0.0000007
EARTH	2103-04-22 07:33	2.4	0.1557577	0.1557254	0.0000108

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
44.97262549	88.12436174	0.09365713	MINIMUM
241.32884391	273.04909914	0.09951298	MINIMUM
323.78864468	356.94148060	0.23435336	SADDLE
142.01936871	185.56391225	0.26902143	SADDLE
359.02279520	217.15114725	1.87707423	SADDLE
188.77637873	47.15154930	2.14726986	MAXIMUM

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MOID Plots

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